Channelization method in whitespace band and apparatus for the same

Abstract

A wireless communication system is disclosed. Specifically, a channelization method in a whitespace band and an apparatus for the same are disclosed. A method for providing whitespace operation information includes transmitting, by a first station (STA) to a second STA, a frame including a TV whitespace high throughput (TVHT) operation information field. The TVHT operation information field includes primary channel number, channel width, channel center frequency segment 0 and channel center frequency segment 1 subfields. A channel center frequency of frequency segment 0 or frequency segment 1 is determined based on a channel start frequency. The channel start frequency is determined as a function of a TV channel index corresponding to the frequency segment 0 or a TV channel index corresponding to the frequency segment 1.

What is claimed is: 
     
       1. A method for providing whitespace operation information, the method comprising:
 transmitting, by a first station (STA) to a second STA, a frame including a TV whitespace high throughput (TVHT) operation information field, 
 wherein the TVHT operation information field includes a primary channel number, a channel width, a channel center frequency segment 0 and a channel center frequency segment 1 subfields, 
 wherein:
 a channel center frequency of a frequency segment 0 is determined based on a function of a channel start frequency and a TV channel index corresponding to the frequency segment 0, and 
 a channel center frequency of a frequency segment 1 is determined based on the function of the channel start frequency and a TV channel index corresponding to the frequency segment 1 respectively, 
 
 wherein the TV channel index corresponding to the frequency segment 0 indicates the index of a lowest TV channel in an operating channel when the channel width corresponds to two contiguous basic channel units (BCUs) or four contiguous BCUs, and 
 wherein the TV channel index corresponding to the frequency segment 0 indicates the index of a lowest TV channel in the frequency segment 0, and the TV channel index corresponding to the frequency segment 1 indicates the index of a lowest TV channel in the frequency segment 1, when the channel width corresponds to two non-contiguous BCUs or four non-contiguous BCUs. 
 
     
     
       2. The method according to  claim 1 , wherein the channel start frequency is set to a center frequency of a TV channel corresponding to a 0-th TV channel index on the basis of the TV channel index corresponding to the frequency segment 0 or the TV channel index corresponding to the frequency segment 1. 
     
     
       3. The method according to  claim 1 , wherein the frequency segment 0 is a frequency segment including a primary channel. 
     
     
       4. The method according to  claim 1 , wherein the frequency segment 1 is a frequency segment that does not include a primary channel. 
     
     
       5. The method according to  claim 1 , wherein:
   Channel center frequency=Channel starting frequency+TVHT_ W ×dot11CurrentChannelCenterFrequencyIndex+ChannelCenterFrequencyCorrection,
 
 where:
 Channel center frequency is the center frequency of a channel, 
 Channel starting frequency is the channel start frequency, 
 TVHT_W denotes one BCU, 
 dot11CurrentChannelCenterFrequencyIndex is the TV channel index corresponding to the frequency segment 0 or the TV channel index corresponding to the frequency segment 1, and 
 ChannelCenterFrequencyCorrection is a predetermined correction value. 
 
 
     
     
       6. The method according to  claim 5 , wherein:
 the predetermined correction value is 0 if a PPDU (Physical layer convergence procedure (PLCP) Protocol Data Unit) is transmitted using a BCU or two non-contiguous BCUs; 
 the predetermined correction value is 0.5×TVHT_W if the PPDU is transmitted using two contiguous BCUs or two non-contiguous frequency segments; 
 the predetermined correction value is 1.5×TVHT_W if the PPDU is transmitted using four contiguous BCUs; and 
 each frequency segment includes two contiguous BCUs. 
 
     
     
       7. The method according to  claim 1 , wherein:
 the TVHT operation information field has a size of 4 octets; 
 each of the primary channel number, the channel width, the channel center frequency segment 0; and 
 the channel center frequency segment 1 subfields has a size of 1 octet. 
 
     
     
       8. The method according to  claim 1 , wherein:
 the first STA is an access point (AP) STA; and 
 the second STA is a non-AP STA. 
 
     
     
       9. A method for receiving whitespace operation information, the method comprising:
 receiving, by a second station (STA) from a first STA, a frame including a TVHT operation information field, 
 wherein the TVHT operation information field includes a primary channel number, a channel width, a channel center frequency segment 0, and a channel center frequency segment 1 subfields, 
 wherein:
 a channel center frequency of a frequency segment 0 is determined based on a function of a channel start frequency and a TV channel index corresponding to the frequency segment 0, and 
 a channel center frequency of a frequency segment 1 is determined based on the function of the channel start frequency and a TV channel index corresponding to the frequency segment 1 respectively, 
 
 wherein the TV channel index corresponding to the frequency segment 0 indicates the index of a lowest TV channel in an operating channel when the channel width corresponds to two contiguous basic channel units (BCUs) or four contiguous BCUs, and 
 wherein the TV channel index corresponding to the frequency segment 0 indicates the index of a lowest TV channel in the frequency segment 0, and the TV channel index corresponding to the frequency segment 1 indicates the index of a lowest TV channel in the frequency segment 1, when the channel width corresponds to two non-contiguous BCUs or four non-contiguous BCUs. 
 
     
     
       10. A station (STA) device providing whitespace operation information, comprising:
 a transceiver; and 
 a processor configured to:
 control the transceiver; and 
 control the STA device to transmit a frame including a TVHT operation information field to another STA device using the transceiver, 
 wherein the TVHT operation information field includes a primary channel number, a channel width, a channel center frequency segment 0, and a channel center frequency segment 1 subfields, 
 wherein:
 a channel center frequency of a frequency segment 0 is determined based on a function of a channel start frequency and a TV channel index corresponding to the frequency segment 0, and 
 a channel center frequency of a frequency segment 1 is determined based on the function of the channel start frequency and a TV channel index corresponding to the frequency segment 1 respectively, 
 
 wherein the TV channel index corresponding to the frequency segment 0 indicates the index of a lowest TV channel in an operating channel when the channel width corresponds to two contiguous basic channel units (BCUs) or four contiguous BCUs, and 
 wherein the TV channel index corresponding to the frequency segment 0 indicates the index of a lowest TV channel in the frequency segment 0, and the TV channel index corresponding to the frequency segment 1 indicates the index of a lowest TV channel in the frequency segment 1, when the channel width corresponds to two non-contiguous BCUs or four non-contiguous BCUs. 
 
 
     
     
       11. A station (STA) device receiving whitespace operation information, comprising:
 a transceiver; and 
 a processor configured to:
 control the transceiver; and 
 control the STA device to receive a frame including a TVHT operation information field from another STA device using the transceiver, 
 wherein the TVHT operation information field includes a primary channel number, a channel width, a channel center frequency segment 0, and a channel center frequency segment 1 subfields, 
 wherein:
 a channel center frequency of a frequency segment 0 is determined based on a function of a channel start frequency and a TV channel index corresponding to the frequency segment 0, and 
 a channel center frequency of a frequency segment 1 is determined based on the function of the channel start frequency and a TV channel index corresponding to the frequency segment 1 respectively, 
 
 wherein the TV channel index corresponding to the frequency segment 0 indicates the index of a lowest TV channel in an operating channel when the channel width corresponds to two contiguous basic channel units (BCUs) or four contiguous BCUs, and 
 wherein the TV channel index corresponding to the frequency segment 0 indicates the index of a lowest TV channel in the frequency segment 0, and the TV channel index corresponding to the frequency segment 1 indicates the index of a lowest TV channel in the frequency segment 1, when the channel width corresponds to two non-contiguous BCUs or four non-contiguous BCUs.